UPF 50 + Light Knee 2 Sleeves

Castelli UPF 50 + Light Knee 2 Sleeves The Castelli UPF 50 + Light Knee 2 Sleeves serve to keep a chill off your knees while also providing reliable protection from the sun. The Solare fabric is rated UPF (ultraviolet protection factor) 50+, preventing harmful sun rays from damaging your skin. They're ideal for cool to mild sunny days, with excellent moisture management to deal quickly with sweat as temperatures rise. A silicone elastic gripper at the top ensures they stay nicely in place for the duration of your ride.